Based on another post I read, I tried this and it's been pretty good at raising the humidity during shed time. If I was going to use it all the time would probably use a small 'reptile water bowl' or maybe heavy glass bowl.
Basically you roll up a few paper towels into a 'tube' and put each end in the water. The device's Patented Capillary Action™ draws water up from the container as the water evaporates off of the top. You'll be surprised at how much water this uses as it is constantly being pulled up from the bowl and into the air of the enclosure.